. we're here today to learn more about what we can do. >> reporter: disasters teach us lessons. and there's plenty to learn in disaster-prone japan. events like this one, more people are learning how they can prepare themselves for the worst. iku tanaka, nhk world, okahama. >>> many tourists head to the northern japanese island of hokkaido. some go to see what's been described as a world of whiteness. nhk world's rino nakana has a look of one of the world's spectacles. >> reporter: we are back outside for another cold day. 9 degrees below zero. that's the temperature here. you won't hear any waves crashing here. everything you see behind me is ice. it's called drift ice, they are pieces of ice drifting on the surface of the water. you might be wondering what is so special about pieces of ice floating around. well, in huge quantities, it's actually quite a spectacle. so much so that every january to february many tourists book drift ice boat tours and cruises just to get a glimpse of the site. now, drift ice comes from up to 1,000 kilometers away from the amura river in russia.